dead Falcon

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damanloox
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dead Falcon

Postby damanloox » Fri Nov 02, 2018 9:25 pm

I have a dead Falcon (ie black scren).
So far I've managed to get the following (I only have basic tools ie. multimeter that can also measure frequency up to 10mhz):

CPU:
BERR - high
HALT - high
RESET - high

COMBO:
BMODE - low
BERR - high

When I'm measuring frequency on CPU pin 6 I'm only getting 8 MHz (and I think it should be 16 MHz). I can't measure frequency on COMBO as my meter can only do 10MHz max...
I have replaced reset switch as it was faulty and I also replaced NVRAM and did countles "left ALT + CONTROL + right SHIFT + UNDO"...
Unfortunately the Falcon is still dead.. No sounds from keyboard, no floppy activity at all.
Also - CPU is getting pretty hot after two or three minutes.
Any suggestions what I could check next?

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Re: dead Falcon

Postby Greenious » Fri Nov 02, 2018 9:55 pm

Download the F030 service guide from https://www.dev-docs.org/
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Re: dead Falcon

Postby damanloox » Fri Nov 02, 2018 10:00 pm

I did that... And I think I did all I could with my limited toolset but perhaps somebody has some ideas..?

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Re: dead Falcon

Postby Greenious » Fri Nov 02, 2018 10:02 pm

Is the RAM card installed properly? Have your reseated the TOS eprom?
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Re: dead Falcon

Postby damanloox » Fri Nov 02, 2018 10:06 pm

I've no ram card and yes - TOS was reseated...

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Re: dead Falcon

Postby Greenious » Fri Nov 02, 2018 10:07 pm

No ram, there's your answer
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Re: dead Falcon

Postby Greenious » Fri Nov 02, 2018 10:08 pm

I believe Arne got ram cards for sale.

http://atari.team-yankee.net/pages/atar ... e/shop.php
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Re: dead Falcon

Postby damanloox » Wed Nov 14, 2018 4:41 pm

ok, new ram card installed and.. still dead.. Any other ideas...?

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Re: dead Falcon

Postby mpattonm » Wed Nov 14, 2018 7:16 pm

Where are you from?

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Re: dead Falcon

Postby Greenious » Wed Nov 14, 2018 7:19 pm

Have you got a jumper across... hmm.. pin 21-22 on the expansion port? Without it the cpu is disabled.
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Re: dead Falcon

Postby Greenious » Wed Nov 14, 2018 7:23 pm

The first image in this thread shows the (blue) jumper clearly.

viewtopic.php?t=29257
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Re: dead Falcon

Postby damanloox » Wed Nov 14, 2018 8:20 pm

yes - the jumper is there (pins 20-22)... TOS reseated... Still dead...
I'm a bit concerned about a resistor between Y2 and U58 (picture attached) but it may be from factory (this is rather early falcon as far as I can see)...
Anyway - I'm stuck. (And I'm in Ireland)...

falcon.jpg
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Re: dead Falcon

Postby mpattonm » Thu Nov 15, 2018 8:50 am

If you have EPROM programmer that supports PAL/GALs, you could rea&verify contents of those 5 that are on Falcon mainboard. PALs/GALs are known to change their contents randomly with age.

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Re: dead Falcon

Postby czietz » Thu Nov 15, 2018 9:58 am

mpattonm wrote:If you have EPROM programmer that supports PAL/GALs, you could rea&verify contents of those 5 that are on Falcon mainboard. PALs/GALs are known to change their contents randomly with age.


Are Falcon GALs/PALs really readable, i.e. don't have their read-protect fuse blown?

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Re: dead Falcon

Postby Greenious » Thu Nov 15, 2018 10:18 am

damanloox wrote:Anyway - I'm stuck. (And I'm in Ireland)...


Well, I can't get you out of Ireland, but we can try finding the fault on your F030... :lol:

Do you have a clockpatch on the CPU? There are numerous variants out there, so it's difficult to say how it should look/work, but check it for any bad solderings, shorts etc. Maybe even remove it for now.
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Re: dead Falcon

Postby mpattonm » Thu Nov 15, 2018 10:25 am

czietz wrote:
mpattonm wrote:If you have EPROM programmer that supports PAL/GALs, you could rea&verify contents of those 5 that are on Falcon mainboard. PALs/GALs are known to change their contents randomly with age.


Are Falcon GALs/PALs really readable, i.e. don't have their read-protect fuse blown?

So far I have seen Falcons with unprottected PALs only. But while its hard to guess what PALs on this specific unit look like, it will be quite obvoius once he tries to read from it.
The other option is to get a spare programmed GAL set and try it in. Should not cost too much.

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Re: dead Falcon

Postby damanloox » Thu Nov 15, 2018 10:27 am

There don't seem to be anything on the CPU (although I'm pretty sure it has been replaced previously). I'll post the picture later this evening.
Any idea why it won't switch to 16mhz and stays at 8mhz...?
As for the PALs/GALs - can somebody tell me where they are on the motherboard? I don't know if my programmer supports them but it supports GAL16V8D which I think are replacements for the originals - the only problem is that I can't find rom images anywhere on the internet... Does anybody have PALs/GALs images..?

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Re: dead Falcon

Postby mpattonm » Thu Nov 15, 2018 10:45 am

There are four 16"something"8 left to the RTC chip: U62, U63, U67, U68 and one 20"something"8 just right to the memory slot. Its U44 I guess

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Re: dead Falcon

Postby mpattonm » Thu Nov 15, 2018 11:05 am

GAL listings as follows
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Re: dead Falcon

Postby damanloox » Sun Dec 02, 2018 1:36 pm

Thanks!
Now - the zip has .GAL and .JED files - any idea how to program the GALS using "universal" eprom programmer (that supports GALs)?

EDIT: OK - I think it's JED files that I need to use...
I downloaded original GAL content (JED) and they seem to be exactly the same so I'm guessing the GALs are OK...

Any ideas what to do next? I'm thinking replace CPU...?

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Re: dead Falcon

Postby damanloox » Sun Dec 02, 2018 3:07 pm

OK - I managed to get green screen (with some noise)... I also noticed that somebody was very interested in STV8438 as there are signs of it being removed... but - I don't think STV8438 is the source of the problem (as my diag cart should work over the serial ie. witbhout the screen and it doesn't...).
So - any other ideas? And/or perhaps somebody has spare STV8438?

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Re: dead Falcon

Postby mpattonm » Sun Dec 02, 2018 4:52 pm

I sure have few in a drawer.

Anyway, I think its time to get a diag cartridge and start from there. This is an easy one to make: https://easyeda.com/nplanel/Atari_Test_ ... 11bc35f41c
Or I can get one for you along with STV8438 should you really need one.

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Re: dead Falcon

Postby damanloox » Sun Dec 02, 2018 5:04 pm

I have diag cart (as I mentioned in this topic) and it gives zero output (neither to screen nor serial port...).
I will definitely have to replace STV8438 - several pins are not soldered at all (they have solde paste on them but somebody apparently forgot to apply heat ;))
Anyway - does anybody know what that chip is for in the Falcon and if it can cause the machine to not boot at all?

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Re: dead Falcon

Postby mpattonm » Sun Dec 02, 2018 8:19 pm

Most of them. You really need to get that diag cartridge up and running to get some helpful advice.
What do you read a serial output with, if I may ask?

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Re: dead Falcon

Postby damanloox » Sun Dec 02, 2018 11:45 pm

mpattonm wrote:You really need to get that diag cartridge up and running to get some helpful advice.

I'd love to but the falcon is dead to the point diagnostic cartridge doesn't help ie. it does nothing... No output at all.
mpattonm wrote:What do you read a serial output with, if I may ask?

Serial console/tera term. Works perfectly with other machines (eg. TT with diag cartridge). So either my settings are incorrect (and I'm using exact serial settings as specified in service manual) or the falcon is dead.


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